I'll start with a more regular ESP8266 module, this time with double the Flash storage, and half the FCC certification! Take it or leave it..

CPU: Tensilica LX106 @ 160MHz
RAM: 36KB available to user
Flash: 8MB
WiFi: 802.11n up to 65Mbps
GPIO: Up to 17
I2C: 1
SPI: 2
PWM: 4
UART: 2
ADC: 1x 0-1V ~1MSPS converter

The chip we've been waiting for, the ESP32 is here! Not just a faster processor but two of them, plus Bluetooth, a funky Ultra-Low-Power processor which can operate with only 20uA consumption, an on-die magnetometer and programmable analog amplifier, and a ton more random toys.

CPU: Dual Core Tensilica LX6 @ 240MHz
RAM: 520KB
Flash: 16MB
WiFi: 802.11n up to 150Mbps
Bluetooth: BT4.0 + BLE
GPIO: 32
I2C: 2
SPI: 3
PWM: 32
UART: 3
ADC: 12 channel 12-bit 2MSPS ADC

Now for the shiny new Realtek offering. If it wasn't for the ESP32 just arriving, this module might have been a big hit. Heck, it still may, what do I know - but for now it seems stuck to the sidelines.

CPU: Cortex M3 @ 166MHz
RAM: 48KB available to user
Flash: 1MB
WiFi: 802.11n up to 150Mbps
GPIO: Up to 21
I2C: 3
SPI: 2
PWM: 4
UART: 3
ADC: 0 (has a 10-bit ADC, but used internally for the radio)

A breadboard compatible RTL8710 module, essentially a replacement for the NodeMCU, at least in theory ;) We'll see how the software support matures.